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Old October 24th 05, 01:34 AM
TRABEM
 
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Default High Q caps for 60 Khz loop antenna?

Hi John,

The loop is already bigger then my house and buying the large diameter
wire to make it was not cheap. Buying an additional length just to add
another turn would not be easy on me physically. Further, the R(ac),
and therefore the Q would suffer since the loops resistance is now
doubled by the addition of a second turn.

I am going to feed this into a quadrature front end, which has a
problem with harmonics getting into the receiver. My hope is to use
the loop as the sole tuning for the front end of the receiver, so
maintaining the highest possible Q is imperative.

In terms of labor and cost, it is much more practical to use a larger
value capacitor to get higher Q than it would be to use larger cable
and more turns of it for the loop.

So, I will try to stick with the larger diameter single turn loop,
which I why I asked for suggestions on which type of capacatior to buy
to resonate the loop with.

Thanks to all who replied. I appreciate all the comments.

T


Is there any possibility that you could add turns to your loop, to
lower the size of the capacitor needed?




 
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